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The thing with the proper moonwatch is that it hasn’t changed since 1969 or whenever they last had it recertified. Whereas the Sub is a very different watch that has evolved over decades.
Hesalite scratches but sapphire shatters. Hesalite/acrylic is a better choice for a tool watch. Seiko are finally putting sapphire crystals and ceramic bezels (also prone to shattering) in their pro level divers because the market demands it, but they really didn’t want to for a long time.
I'm not a fan of the speedy myself.
And don't think a tool watch should have anything less than sapphire crystal. I don't think This isn't a tool watch, not with a hesalite crystal.
Same for rolex. The originals were tool watches, but today's iteration is certainly not.
By sticking to its heritage, no longer makes it a tool watch.